The Reverend Oliver Ross left his roles at two churches in London in June and was due to become the vicar at Malmesbury Abbey this month, but his licensing has been deferred.
A spokesman for the Diocese of Bristol, which manages Malmesbury, said: "Following a change of circumstances, the licensing of Oliver Ross was unable to take place at Malmesbury Abbey on Thursday evening and has been deferred until further notice."
The nature of the allegations is not currently known.
A spokesman for the Diocese of London, said: "The Revd Oliver Ross left his roles in the Diocese of London, as Guild Vicar at St Katherine Cree and Rector at St Olave Hart Street in June 2018, to take up a new post in Bristol Diocese.
"Subsequent to his departure, the Diocese of London has identified serious breaches of employment law at St Katherine Cree and St Olave.
"The Home Office has been notified, as has Bristol Diocese, and the Diocese of London is now investigating further."
Malmesbury Abbey has been approached for comment.